Abstract: Tools and methods for measuring resistivity are provided. The tool for measuring resistivity in a formation comprises a receiver module comprising a first electromagnetic signal receiver and a second electromagnetic signal receiver; a first electromagnetic signal transmitter removably coupled to one longitudinal end of the receiver module; a second electromagnetic signal transmitter removably coupled to the other longitudinal end of the receiver module; and each of the first and the second electromagnetic signal receivers configured to receive electromagnetic signals propagating in the formation from the first and the second electromagnetic signal transmitters.

Abstract: Systems and methods for communicating downhole signals using a mud pulser. The method includes encoding data collected from a downhole sensor as symbols into electrical pulses received by the mud pulser; transmitting the electrical pulses as pressure pulses through using the mud pulser; converting the pressure pulses into full wave pressure signals; processing the full wave pressure signals to recover the symbols; and decoding the symbols to provide the data.

Abstract: Systems and methods for communicating downhole signals using a mud pulser. The method includes encoding data collected from a downhole sensor as symbols into electrical pulses received by the mud pulser; transmitting the electrical pulses as pressure pulses through using the mud pulser; converting the pressure pulses into full wave pressure signals; processing the full wave pressure signals to recover the symbols; and decoding the symbols to provide the data.

Abstract: Tools and methods for measuring resistivity are provided. The tool for measuring resistivity in a formation comprises a receiver module comprising a first electromagnetic signal receiver and a second electromagnetic signal receiver; a first electromagnetic signal transmitter removably coupled to one longitudinal end of the receiver module; a second electromagnetic signal transmitter removably coupled to the other longitudinal end of the receiver module; and each of the first and the second electromagnetic signal receivers configured to receive electromagnetic signals propagating in the formation from the first and the second electromagnetic signal transmitters.

Abstract: A system and method of transmitting measurement-while-drilling (MWD) data while drilling a wellbore in a subterranean formation are provided. The system utilizes a transmission sub located uphole of the drill bit which transmits an electromagnetic signal through the surrounding drilling fluid to a receiver assembly located farther uphole at a position suitable for relaying the signal to the surface.